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The problem

Suppose we have a paragraph that contains the following words:

A B C D E F G H I J K L

Then suppose we want to group each of the sentences as follows:

(A B C D) (E F G H) (I J K L)

Okay. So now we got the sentences in. Now suppose we want to group line groups as follows:

(A B {C D) (E F} {G H) (I J} K L)

Well, thats looks nice on the wiki, but this is an example of overlapping hierarchies, which is difficult to encode into XML since the following is invalid ( using <s> for sentence ) :

<s>A B<lg>C D</s><s>E F</lg><lg>G H</s><s>I J</lg>K L</s>